Metal gasket

ABSTRACT

In a chain driving engine, in order to uppermost prevent to adhere the rubber made elastic seal member set by inner rim of an opening for chain of a metal gasket used as joint seal which contains three contacting area portion of a chain case and a cylinder block and an underside of cylinder head, the metal gasket is constituting below.  
     A metal gasket is setting an elastic seal member set an inner rim of a chain opening of the metal gasket, and a through hole is set a metal plate part of outside of the elastic seal member for storing a spilled liquid gasket material when it is overtightening.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] Present invention relates to improvement of a metal gasket used as a joint seal containing three contacting area portion of a cylinder block, a chain case and a cylinder head constructing an internal combustion engine.

[0003] 2. Description of the Prior Art

[0004] In a chain driving engine, an independently manufactured chain case 2 is a neighbor-contacted with cylinder block 1 tightly, as shown by FIGS. 19 and 20. In a three contacting area portion of these area that is chain case and cylinder block is contacting area, and an underside of cylinder head 3, is demounted through a metal gasket A. Therefore, above-described three contacting area portion is added seal function. B is a metal gasket demounted through a contacting area between a cylinder block and a chain case. A-A line shows a contacting boundary of a cylinder block 1 and a chain case 2.

[0005] In these structures that are independently manufactured chain case 2 and cylinder block 1, a level h is slightly existence by thermal expansion difference between cylinder block 1 and chain case 2 as shown by FIG. 21.

[0006] The occurrence of the above mentioned level h leads to decrease a seal function. On this account, edge of an opening for chain 4 of the metal gasket A side is set elastic seal member having a semicircle cross sectional view before mentioned level h astriding elastomer bead or the like. Thereby combinating by paste like liquid gasket and member to ensure having good sealing characteristics is applied.

[0007] However, when between a cylinder head and chain case and/or cylinder block is overtightened, then liquid gasket matter spills by overtightening pressure and rubber-like elastomer is degradated. As a result, crack is occurred, or a sealing characteristic is decreased by decreasing a rubber elasticity. Thereby an engine oil leakage is occurred. Rubber elastomer set before-mentioned metal gasket is overpressed, when it overtightened, discrepancy exists that elastic reconstruction enforcement is lost.

SUMMARY OF THE INVENTION

[0008] In accordance with one aspect of the present invention, there is provided, to achieve the object above, there is provided a metal gasket for sealing a three contacting area portion of a cylinder block, a chain case and a cylinder head; said metal gasket having an elastic seal member set an inner rim of a chain opening a storing means of liquid gasket material for sealing the three contacting area portion.

[0009] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein said the elastic seal member is applied to protecting pellicle.

[0010] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein said the storing means is a through hole set a metal plate part neighboring to said elastic seal member.

[0011] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein said the storing means is a concave-like different in level part set a metal plate part neighboring to said elastic seal member.

[0012] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein said the storing means is a through hole and a concave-like different in level part set a metal plate part neighboring to said elastic seal member.

[0013] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein said the storing means is set by inflating a part arranged three contacting area portion with metal plate part of the metal gasket so as to seal trace is directing to outside, and a void part formed by an inflated part obtained by the inflating is a store part of liquid gasket material and a through hole 8 is set outside of the store part.

[0014] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein a through hole is set for receiving a spilled liquid gasket from said inner rim part.

[0015] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein said metal gasket having a concave-like different in level part.

[0016] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein at overtightened, a through hole and a concave-like different in level part for receiving a spilled liquid gasket from said inner rim part.

[0017] In accordance with one aspect of the present invention, there is provided a metal gasket according to claimed in claim 1; wherein said elastic seal member is applied to protecting pellicle.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The objects and features of the present invention will become more apparent from the consideration of the following detailed description taken in conjunction with the accompanying drawings in which:

[0019]FIG. 1 is a plan view showing an embodiment of a main metal gasket of the present invention;

[0020]FIG. 2 is a magnified cross-sectional view along a line Y₁-Y₁, of the metal gasket of FIG. 1;

[0021] FIGS. 3 (I) to 3 (III) are cross-sectional view showing an example of an elastic seal member conjugating a metal gasket;

[0022]FIG. 4 is an explanation drawing showing a configuration of elastic seal member for chain case cover hole;

[0023]FIG. 5 is a plan view showing another embodiment of a main metal gasket;

[0024]FIG. 6 is a magnified cross-sectional view along a line Y₂-Y₂ of the metal gasket of FIG. 5;

[0025]FIG. 7 is a plan view showing further another embodiment of a main metal gasket;

[0026]FIG. 8 is a magnified cross-sectional view along a line Y₃-Y₃ of the metal gasket of FIG. 7;

[0027]FIG. 9 is a plan view showing further another embodiment of a main metal gasket;

[0028]FIG. 10 is a magnified cross-sectional view along a line Y₄-Y₄ of the metal gasket of FIG. 9;

[0029]FIG. 11 is a plan view showing further another embodiment of a main metal gasket;

[0030]FIG. 12 is a magnified cross-sectional view along a line Y₅-Y₅ of the metal gasket of FIG. 11;

[0031]FIG. 13 is a plan view showing further another embodiment of a main metal gasket;

[0032]FIG. 14 is a magnified cross-sectional view along a line Y₆-Y₆ of the metal gasket of FIG. 13;

[0033] FIGS. 15 (I) to 15 (III) are cross-sectional views showing an example of an elastic seal member conjugating a metal gasket;

[0034]FIG. 16 is an explanation drawing showing a configuration of elastic seal member for chain case cover hole;

[0035]FIG. 17 is a magnified cross-sectional view along a line Y₂-Y₂ of the metal gasket of FIG. 16;

[0036]FIG. 18 is a magnified cross-sectional view along a line X₂-X₂ of the metal gasket of FIG. 16;

[0037]FIG. 19 is an outline constituting drawing of a prior art of a chain driving engine;

[0038]FIG. 20 is a plan view of the engine;

[0039]FIG. 21 is a disassembling constituting drawing of the above engine;

[0040]FIG. 22 is a plan view of a prior art of a metal gasket for chain driving engine;

[0041]FIG. 23 is a magnified cross-sectional view along a line X-X of FIG. 16; and

[0042]FIG. 24 is a side view showing a constituting of a part combining a liquid gasket material with a metal gasket.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] Referring next to the drawings, description will be given in detail of a metal in accordance with the present invention.

[0044] In FIGS. 1 to 4,an embodiment of the present invention is shown. In these FIGS. 13 to 18, same or similar member(s) of FIGS. 1 to 4 is suffixed a same numerals.

[0045] A is a metal gasket. In inner side edge of the metal gasket A of an opening for chain 4, a rubber elastic seal member 7 having a circle cross section is set for interposing. In the metal gasket A, a through opening portion 8 is set in a metal part of outside of the three contacting area portion of a elastic seal member 7.

[0046] By applying to above constitution, when a cylinder head and chain case and/or cylinder block is overtightened, a through hole 8 is absorbed and stored a poured liquid gasket material. As a result, the liquid gasket material can be uppermost prevented to adhere the rubber made elastic seal member 7.

[0047] By applying to above constitution which is set in inner rim of the metal gasket A of an opening for chain 4, a rubber elastic seal member 7 having a circle cross section for interposing, there is an advantage that the liquid gasket material can be stored through an amount of depth of the seal member diameter.

[0048] The rubber elastic seal member 7 having a circle type cross-section is simple to interposing a metal gasket side shown by FIG. 2. It may apply to constitution joining with the metal gasket as shown by FIGS. 3(I) to (III).

[0049]FIG. 3(I) is constitution that is set a tapered part in the metal gasket and is set an elastic seal member 7 in the taper part to inner side part. In a joint part 7-1, a compressed part 7-2 to be a way of escape when elastic seal member 7 is compressed is set.

[0050]FIG. 3(11) may be applied to the tapered part is trapezoid and FIG. 3(III) may be applied to the tapered part is a tapered concave form or an another tapered form. By comparing a constitution of FIG. 2, constitutions of FIGS. 3(I) to (III) may be compressed up to plating thickness of the metal gasket.

[0051] The above elastic seal member is not limited to a circle type cross section. For example, it may apply to a rectangular shape. When the member 7 may be obtained the above seal function, then it is applicable another cross section form to select and use optionally.

[0052] Material of the elastic seal member is not limited to rubber material. When material having a rubber elasticity is used, then it is applicable another material to select and use optionally. The above metal gasket may be not used a metal plate, but a laminated thin plate having thermo-resistivity.

[0053] The above metal gasket is no special limitation of the constitution, for example, it may applicable to a constitution that a superposed portion of the surface on chain case is formed independently, and the superposed portion is combined with a metal gasket superposed cylinder block on the surface.

[0054] An another embodiment shows according to FIGS. 5 and 6. The present embodiment is substituted a concave-like different in level part 9 for the through hole 8 of the before mentioned embodiment. The above concave-like different in level part 9 is formed by cutting work in predetermined depth from surface of a metal part analogous to the three contacting area portion and by pressing.

[0055] Furthermore, an another embodiment is shown by FIGS. 7 and 8. The present embodiment is having both of a concave-like different in level part 9 and a through hole 8.

[0056] Furthermore, an another embodiment is shown by FIGS. 9 and 10. The present embodiment is apply to a constitution that is set by inflating a part arranged three contacting area portion with metal plate part of the metal gasket so as to seal trace is directing to outside, and a void part 10 formed by an inflated part 7 a obtained by the inflating is a store part of liquid gasket material and a through hole 8 is set outside of the store part.

[0057] By applying to the above described constitution, when between a cylinder head and chain case and/or cylinder block is overtightened, spilled liquid gasket matter by absorbing both of the above-mentioned void space 10 and the through hole 8 can stored.

[0058]FIGS. 11 and 12 show another embodiment of the present invention.

[0059] The present embodiment is constituted by combination of the through hole 8 of the embodiment according to FIGS. 9 and 10 and the concave-like different in level part 9 of the embodiment according to FIGS. 5 and 6.

[0060] According to each of the above-mentioned embodiments, it is preferred that a protecting pellicle is applied to for a elastic seal member and furthermore, not only the elastic seal member but a metal plate may be coated.

[0061] FIGS. 13 to 16 show another embodiment of the present invention.

[0062] A is a metal gasket, inner rim of an opening for chain 4 of the metal gasket A, rubber elastic seal member 7 is set by interposing. FIG. 14 shows elastic seal member 7 cut along a line Y₁-Y₁, of FIG. 13.

[0063] As above, in accordance with the present invention, there are provided a metal gasket used as a connecting seal containing a three contacting area portion of cylinder block, chain case and cylinder head; said metal gasket having;

[0064] an elastic seal member set an inner rim of a chain opening; a storing means of liquid gasket material for sealing the three contacting area portion. Therefore, the metal gasket is obtained not only a superior to seal characteristic but maintaining a long period of time without deterioration of seal characteristic.

[0065] The metal gasket constituting a metal plate part of outside of the elastic seal member set a through hole and/or a concave-like different in level part, is overtightened, spilled liquid gasket matter can be uppermost prevented to adhere. 

What is claimed is:
 1. A metal gasket for sealing a three contacting area portion of a cylinder block, a chain case and a cylinder head; said metal gasket having; an elastic seal member set an inner rim of a chain opening; a storing means of liquid gasket material for sealing the three contacting area portion.
 2. The metal gasket according to claimed in claim 1 ; wherein said the elastic seal member is applied to protecting pellicle.
 3. The metal gasket according to claimed in claim 1 ; wherein said the storing means is a through hole set a metal plate part neighboring to said elastic seal member.
 4. The metal gasket according to claimed in claim 1 ; wherein said the storing means is a concave-like different in level part set a metal plate part neighboring to said elastic seal member.
 5. The metal gasket according to claimed in claim 1 ; wherein said the storing means is a through hole and a concave-like different in level part set a metal plate part neighboring to said elastic seal member.
 6. The metal gasket according to claimed in claim 1 ; wherein said the storing means is set by inflating a part arranged three contacting area portion with metal plate part of the metal gasket so as to seal trace is directing to outside, and a void part formed by an inflated part obtained by the inflating is a store part of liquid gasket material and a through hole 8 is set outside of the store part.
 7. The metal gasket according to claimed in claim 6 ; wherein a through hole is set for receiving a spilled liquid gasket from said inner rim part.
 8. The metal gasket according to claimed in claim 7 ; wherein said metal gasket having a concave-like different in level part.
 9. The metal gasket according to claimed in claim 6 ; wherein at overtightened, a through hole and a concave-like different in level part for receiving a spilled liquid gasket from said inner rim part.
 10. The metal gasket according to any one of claims 3 to 9 ; wherein; said elastic seal member is applied to protecting pellicle. 